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Reports unresolved references to plugin configuration elements.

<h4>Extensions</h4>
<p>
  Referencing extension with an unknown <code>id</code> might result in errors at runtime.
</p>
<p>
  The following extension points are supported:
<ul>
  <li><code>com.intellij.advancedSetting</code> in resource bundle <code>advanced.setting.*</code> key</li>
  <li><code>com.intellij.experimentalFeature</code> in <code>Experiments.isFeatureEnabled()/setFeatureEnabled()</code></li>
  <li><code>com.intellij.notificationGroup</code> in <code>Notification</code> constructor and <code>NotificationGroupManager.getNotificationGroup()</code>
  </li>
  <li><code>com.intellij.registryKey</code> in <code>Registry</code> methods <code>key</code> parameter</li>
  <li><code>com.intellij.toolWindow</code> in resource bundle <code>toolwindow.stripe.*</code> key</li>
</ul>

<h4>Extension Point</h4>
<p>
  Extension point name referencing its corresponding <code>&lt;extensionPoint></code> declaration in <code>plugin.xml</code>.
<ul>
  <li><code>com.intellij.openapi.extensions.ExtensionPointName</code> constructor and <code>create()</code></li>
  <li><code>com.intellij.openapi.extensions.ProjectExtensionPointName</code> constructor</li>
  <li><code>com.intellij.openapi.util.KeyedExtensionCollector</code> and inheritors constructor</li>
</ul>
</p>

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